Temperature-dependent thermal properties of spark plasma sintered alumina

Abstract

In this work, we report temperature-dependent thermal properties of alumina powder and bulk alumina consolidated by spark plasma sintering method. The properties were measured between room temperature and 250 ºC using a thermal constants analyzer. Alumina powder had very low thermal properties due to the presence of large pores and absence of bonding between its particles. Fully dense alumina with a relative density of 99.6 % was obtained at a sintering temperature of 1400 °C and a holding time of 10 min. Thermal properties were found to mainly dependent on density. Thermal conductivity, thermal diffusivity, and specific heat of the fully dense alumina were 34.44 W/mK, 7.62 mm 2 s -1 , and 1.22 J/gK, respectively, at room temperature. Thermal conductivity and thermal diffusivity decreased while specific heat increased with the increase in temperature from room temperature to 250 ºC.

Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

“…The thermal conductivity and specific heat were about 34.44 W/mK and 1.22 J/gK, respectively, at room temperature. Thermal conductivity was found to decrease with the increase in temperature and it reached 18.3 W/mK at 250 °C, while specific heat increased and reached a value of 1.55 J/gK at 250 °C, as shown in Figure 9 [132].…”

“…FE-SEM images of fractured surfaces of alumina samples sintered for 10 min. at ( a ) 1000 °C, ( b ) 1300 °C, and ( c ) 1400 °C [132]. …”

Impact of alumina particles on the morphology and mechanics of hybrid wood plastic composite materials

“…Along with the development and increasing use of bioplastic composite materials, there was a need for various mechanical improvements. Alumina particles prepared by different techniques have been used as reinforcements in order to improve particular properties of composite structures [1][2][3]. Hybrid wood-plastic composites (WPC) with biodegradable natural fibers have many advantages, such as low density, high specific strength value, good impact and flexural properties.…”